1/*
2 * Copyright (c) 2001-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Ron Dreslinski
29 * Ali Saidi
30 */
31
32#include <sys/types.h>
33#include <sys/mman.h>
34#include <errno.h>
35#include <fcntl.h>
36#include <unistd.h>
37#include <zlib.h>
38
39#include <iostream>
40#include <string>
41
42
43#include "base/misc.hh"
44#include "config/full_system.hh"
45#include "mem/packet_impl.hh"
46#include "mem/physical.hh"
47#include "sim/host.hh"
48#include "sim/builder.hh"
49#include "sim/eventq.hh"
50#include "arch/isa_traits.hh"
51
52
53using namespace std;
54using namespace TheISA;
55
56
57PhysicalMemory::PhysicalMemory(Params *p)
58 : MemObject(p->name), pmemAddr(NULL), port(NULL), lat(p->latency), _params(p)
59{
60 if (params()->addrRange.size() % TheISA::PageBytes != 0)
61 panic("Memory Size not divisible by page size\n");
62
63 int map_flags = MAP_ANON | MAP_PRIVATE;
64 pmemAddr = (uint8_t *)mmap(NULL, params()->addrRange.size(), PROT_READ | PROT_WRITE,
65 map_flags, -1, 0);
66
67 if (pmemAddr == (void *)MAP_FAILED) {
68 perror("mmap");
69 fatal("Could not mmap!\n");
70 }
71
72 pagePtr = 0;
73}
74
75void
76PhysicalMemory::init()
77{
78 if (!port)
79 panic("PhysicalMemory not connected to anything!");
80 port->sendStatusChange(Port::RangeChange);
81}
82
83PhysicalMemory::~PhysicalMemory()
84{
85 if (pmemAddr)
86 munmap(pmemAddr, params()->addrRange.size());
87 //Remove memPorts?
88}
89
90Addr
91PhysicalMemory::new_page()
92{
93 Addr return_addr = pagePtr << LogVMPageSize;
94 return_addr += params()->addrRange.start;
95
96 ++pagePtr;
97 return return_addr;
98}
99
100int
101PhysicalMemory::deviceBlockSize()
102{
103 //Can accept anysize request
104 return 0;
105}
106
107Tick
108PhysicalMemory::calculateLatency(Packet *pkt)
109{
110 return lat;
111}
112
113
114
115// Add load-locked to tracking list. Should only be called if the
116// operation is a load and the LOCKED flag is set.
117void
118PhysicalMemory::trackLoadLocked(Request *req)
119{
120 Addr paddr = LockedAddr::mask(req->getPaddr());
121
122 // first we check if we already have a locked addr for this
123 // xc. Since each xc only gets one, we just update the
124 // existing record with the new address.
125 list<LockedAddr>::iterator i;
126
127 for (i = lockedAddrList.begin(); i != lockedAddrList.end(); ++i) {
128 if (i->matchesContext(req)) {
129 DPRINTF(LLSC, "Modifying lock record: cpu %d thread %d addr %#x\n",
130 req->getCpuNum(), req->getThreadNum(), paddr);
131 i->addr = paddr;
132 return;
133 }
134 }
135
136 // no record for this xc: need to allocate a new one
137 DPRINTF(LLSC, "Adding lock record: cpu %d thread %d addr %#x\n",
138 req->getCpuNum(), req->getThreadNum(), paddr);
139 lockedAddrList.push_front(LockedAddr(req));
140}
141
142
143// Called on *writes* only... both regular stores and
144// store-conditional operations. Check for conventional stores which
145// conflict with locked addresses, and for success/failure of store
146// conditionals.
147bool
148PhysicalMemory::checkLockedAddrList(Request *req)
149{
150 Addr paddr = LockedAddr::mask(req->getPaddr());
151 bool isLocked = req->isLocked();
152
153 // Initialize return value. Non-conditional stores always
154 // succeed. Assume conditional stores will fail until proven
155 // otherwise.
156 bool success = !isLocked;
157
158 // Iterate over list. Note that there could be multiple matching
159 // records, as more than one context could have done a load locked
160 // to this location.
161 list<LockedAddr>::iterator i = lockedAddrList.begin();
162
163 while (i != lockedAddrList.end()) {
164
165 if (i->addr == paddr) {
166 // we have a matching address
167
168 if (isLocked && i->matchesContext(req)) {
169 // it's a store conditional, and as far as the memory
170 // system can tell, the requesting context's lock is
171 // still valid.
172 DPRINTF(LLSC, "StCond success: cpu %d thread %d addr %#x\n",
173 req->getCpuNum(), req->getThreadNum(), paddr);
174 success = true;
175 }
176
177 // Get rid of our record of this lock and advance to next
178 DPRINTF(LLSC, "Erasing lock record: cpu %d thread %d addr %#x\n",
179 i->cpuNum, i->threadNum, paddr);
180 i = lockedAddrList.erase(i);
181 }
182 else {
183 // no match: advance to next record
184 ++i;
185 }
186 }
187
188 if (isLocked) {
189 req->setScResult(success ? 1 : 0);
190 }
191
192 return success;
193}
194
195void
196PhysicalMemory::doFunctionalAccess(Packet *pkt)
197{
198 assert(pkt->getAddr() + pkt->getSize() <= params()->addrRange.size());
199
200 if (pkt->isRead()) {
201 if (pkt->req->isLocked()) {
202 trackLoadLocked(pkt->req);
203 }
| 1/*
2 * Copyright (c) 2001-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Ron Dreslinski
29 * Ali Saidi
30 */
31
32#include <sys/types.h>
33#include <sys/mman.h>
34#include <errno.h>
35#include <fcntl.h>
36#include <unistd.h>
37#include <zlib.h>
38
39#include <iostream>
40#include <string>
41
42
43#include "base/misc.hh"
44#include "config/full_system.hh"
45#include "mem/packet_impl.hh"
46#include "mem/physical.hh"
47#include "sim/host.hh"
48#include "sim/builder.hh"
49#include "sim/eventq.hh"
50#include "arch/isa_traits.hh"
51
52
53using namespace std;
54using namespace TheISA;
55
56
57PhysicalMemory::PhysicalMemory(Params *p)
58 : MemObject(p->name), pmemAddr(NULL), port(NULL), lat(p->latency), _params(p)
59{
60 if (params()->addrRange.size() % TheISA::PageBytes != 0)
61 panic("Memory Size not divisible by page size\n");
62
63 int map_flags = MAP_ANON | MAP_PRIVATE;
64 pmemAddr = (uint8_t *)mmap(NULL, params()->addrRange.size(), PROT_READ | PROT_WRITE,
65 map_flags, -1, 0);
66
67 if (pmemAddr == (void *)MAP_FAILED) {
68 perror("mmap");
69 fatal("Could not mmap!\n");
70 }
71
72 pagePtr = 0;
73}
74
75void
76PhysicalMemory::init()
77{
78 if (!port)
79 panic("PhysicalMemory not connected to anything!");
80 port->sendStatusChange(Port::RangeChange);
81}
82
83PhysicalMemory::~PhysicalMemory()
84{
85 if (pmemAddr)
86 munmap(pmemAddr, params()->addrRange.size());
87 //Remove memPorts?
88}
89
90Addr
91PhysicalMemory::new_page()
92{
93 Addr return_addr = pagePtr << LogVMPageSize;
94 return_addr += params()->addrRange.start;
95
96 ++pagePtr;
97 return return_addr;
98}
99
100int
101PhysicalMemory::deviceBlockSize()
102{
103 //Can accept anysize request
104 return 0;
105}
106
107Tick
108PhysicalMemory::calculateLatency(Packet *pkt)
109{
110 return lat;
111}
112
113
114
115// Add load-locked to tracking list. Should only be called if the
116// operation is a load and the LOCKED flag is set.
117void
118PhysicalMemory::trackLoadLocked(Request *req)
119{
120 Addr paddr = LockedAddr::mask(req->getPaddr());
121
122 // first we check if we already have a locked addr for this
123 // xc. Since each xc only gets one, we just update the
124 // existing record with the new address.
125 list<LockedAddr>::iterator i;
126
127 for (i = lockedAddrList.begin(); i != lockedAddrList.end(); ++i) {
128 if (i->matchesContext(req)) {
129 DPRINTF(LLSC, "Modifying lock record: cpu %d thread %d addr %#x\n",
130 req->getCpuNum(), req->getThreadNum(), paddr);
131 i->addr = paddr;
132 return;
133 }
134 }
135
136 // no record for this xc: need to allocate a new one
137 DPRINTF(LLSC, "Adding lock record: cpu %d thread %d addr %#x\n",
138 req->getCpuNum(), req->getThreadNum(), paddr);
139 lockedAddrList.push_front(LockedAddr(req));
140}
141
142
143// Called on *writes* only... both regular stores and
144// store-conditional operations. Check for conventional stores which
145// conflict with locked addresses, and for success/failure of store
146// conditionals.
147bool
148PhysicalMemory::checkLockedAddrList(Request *req)
149{
150 Addr paddr = LockedAddr::mask(req->getPaddr());
151 bool isLocked = req->isLocked();
152
153 // Initialize return value. Non-conditional stores always
154 // succeed. Assume conditional stores will fail until proven
155 // otherwise.
156 bool success = !isLocked;
157
158 // Iterate over list. Note that there could be multiple matching
159 // records, as more than one context could have done a load locked
160 // to this location.
161 list<LockedAddr>::iterator i = lockedAddrList.begin();
162
163 while (i != lockedAddrList.end()) {
164
165 if (i->addr == paddr) {
166 // we have a matching address
167
168 if (isLocked && i->matchesContext(req)) {
169 // it's a store conditional, and as far as the memory
170 // system can tell, the requesting context's lock is
171 // still valid.
172 DPRINTF(LLSC, "StCond success: cpu %d thread %d addr %#x\n",
173 req->getCpuNum(), req->getThreadNum(), paddr);
174 success = true;
175 }
176
177 // Get rid of our record of this lock and advance to next
178 DPRINTF(LLSC, "Erasing lock record: cpu %d thread %d addr %#x\n",
179 i->cpuNum, i->threadNum, paddr);
180 i = lockedAddrList.erase(i);
181 }
182 else {
183 // no match: advance to next record
184 ++i;
185 }
186 }
187
188 if (isLocked) {
189 req->setScResult(success ? 1 : 0);
190 }
191
192 return success;
193}
194
195void
196PhysicalMemory::doFunctionalAccess(Packet *pkt)
197{
198 assert(pkt->getAddr() + pkt->getSize() <= params()->addrRange.size());
199
200 if (pkt->isRead()) {
201 if (pkt->req->isLocked()) {
202 trackLoadLocked(pkt->req);
203 }
|
| 204 DPRINTF(MemoryAccess, "Performing Read of size %i on address 0x%x\n",
205 pkt->getSize(), pkt->getAddr());
|
204 memcpy(pkt->getPtr<uint8_t>(),
205 pmemAddr + pkt->getAddr() - params()->addrRange.start,
206 pkt->getSize());
207 }
208 else if (pkt->isWrite()) {
209 if (writeOK(pkt->req)) {
| 206 memcpy(pkt->getPtr<uint8_t>(),
207 pmemAddr + pkt->getAddr() - params()->addrRange.start,
208 pkt->getSize());
209 }
210 else if (pkt->isWrite()) {
211 if (writeOK(pkt->req)) {
|
| 212 DPRINTF(MemoryAccess, "Performing Write of size %i on address 0x%x\n",
213 pkt->getSize(), pkt->getAddr());
|
210 memcpy(pmemAddr + pkt->getAddr() - params()->addrRange.start,
211 pkt->getPtr<uint8_t>(), pkt->getSize());
212 }
213 }
214 else if (pkt->isInvalidate()) {
215 //upgrade or invalidate
216 pkt->flags |= SATISFIED;
217 }
218 else {
219 panic("unimplemented");
220 }
221
222 pkt->result = Packet::Success;
223}
224
225Port *
226PhysicalMemory::getPort(const std::string &if_name, int idx)
227{
228 if (if_name == "port" && idx == -1) {
229 if (port != NULL)
230 panic("PhysicalMemory::getPort: additional port requested to memory!");
231 port = new MemoryPort(name() + "-port", this);
232 return port;
233 } else if (if_name == "functional") {
234 /* special port for functional writes at startup. And for memtester */
235 return new MemoryPort(name() + "-funcport", this);
236 } else {
237 panic("PhysicalMemory::getPort: unknown port %s requested", if_name);
238 }
239}
240
241void
242PhysicalMemory::recvStatusChange(Port::Status status)
243{
244}
245
246PhysicalMemory::MemoryPort::MemoryPort(const std::string &_name,
247 PhysicalMemory *_memory)
248 : SimpleTimingPort(_name), memory(_memory)
249{ }
250
251void
252PhysicalMemory::MemoryPort::recvStatusChange(Port::Status status)
253{
254 memory->recvStatusChange(status);
255}
256
257void
258PhysicalMemory::MemoryPort::getDeviceAddressRanges(AddrRangeList &resp,
259 AddrRangeList &snoop)
260{
261 memory->getAddressRanges(resp, snoop);
262}
263
264void
265PhysicalMemory::getAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
266{
267 snoop.clear();
268 resp.clear();
269 resp.push_back(RangeSize(params()->addrRange.start,
270 params()->addrRange.size()));
271}
272
273int
274PhysicalMemory::MemoryPort::deviceBlockSize()
275{
276 return memory->deviceBlockSize();
277}
278
279Tick
280PhysicalMemory::MemoryPort::recvAtomic(Packet *pkt)
281{
282 memory->doFunctionalAccess(pkt);
283 return memory->calculateLatency(pkt);
284}
285
286void
287PhysicalMemory::MemoryPort::recvFunctional(Packet *pkt)
288{
289 // Default implementation of SimpleTimingPort::recvFunctional()
290 // calls recvAtomic() and throws away the latency; we can save a
291 // little here by just not calculating the latency.
292 memory->doFunctionalAccess(pkt);
293}
294
295unsigned int
296PhysicalMemory::drain(Event *de)
297{
298 int count = port->drain(de);
299 if (count)
300 changeState(Draining);
301 else
302 changeState(Drained);
303 return count;
304}
305
306void
307PhysicalMemory::serialize(ostream &os)
308{
309 gzFile compressedMem;
310 string filename = name() + ".physmem";
311
312 SERIALIZE_SCALAR(filename);
313
314 // write memory file
315 string thefile = Checkpoint::dir() + "/" + filename.c_str();
316 int fd = creat(thefile.c_str(), 0664);
317 if (fd < 0) {
318 perror("creat");
319 fatal("Can't open physical memory checkpoint file '%s'\n", filename);
320 }
321
322 compressedMem = gzdopen(fd, "wb");
323 if (compressedMem == NULL)
324 fatal("Insufficient memory to allocate compression state for %s\n",
325 filename);
326
327 if (gzwrite(compressedMem, pmemAddr, params()->addrRange.size()) != params()->addrRange.size()) {
328 fatal("Write failed on physical memory checkpoint file '%s'\n",
329 filename);
330 }
331
332 if (gzclose(compressedMem))
333 fatal("Close failed on physical memory checkpoint file '%s'\n",
334 filename);
335}
336
337void
338PhysicalMemory::unserialize(Checkpoint *cp, const string §ion)
339{
340 gzFile compressedMem;
341 long *tempPage;
342 long *pmem_current;
343 uint64_t curSize;
344 uint32_t bytesRead;
345 const int chunkSize = 16384;
346
347
348 string filename;
349
350 UNSERIALIZE_SCALAR(filename);
351
352 filename = cp->cptDir + "/" + filename;
353
354 // mmap memoryfile
355 int fd = open(filename.c_str(), O_RDONLY);
356 if (fd < 0) {
357 perror("open");
358 fatal("Can't open physical memory checkpoint file '%s'", filename);
359 }
360
361 compressedMem = gzdopen(fd, "rb");
362 if (compressedMem == NULL)
363 fatal("Insufficient memory to allocate compression state for %s\n",
364 filename);
365
366 // unmap file that was mmaped in the constructor
367 // This is done here to make sure that gzip and open don't muck with our
368 // nice large space of memory before we reallocate it
369 munmap(pmemAddr, params()->addrRange.size());
370
371 pmemAddr = (uint8_t *)mmap(NULL, params()->addrRange.size(), PROT_READ | PROT_WRITE,
372 MAP_ANON | MAP_PRIVATE, -1, 0);
373
374 if (pmemAddr == (void *)MAP_FAILED) {
375 perror("mmap");
376 fatal("Could not mmap physical memory!\n");
377 }
378
379 curSize = 0;
380 tempPage = (long*)malloc(chunkSize);
381 if (tempPage == NULL)
382 fatal("Unable to malloc memory to read file %s\n", filename);
383
384 /* Only copy bytes that are non-zero, so we don't give the VM system hell */
385 while (curSize < params()->addrRange.size()) {
386 bytesRead = gzread(compressedMem, tempPage, chunkSize);
387 if (bytesRead != chunkSize && bytesRead != params()->addrRange.size() - curSize)
388 fatal("Read failed on physical memory checkpoint file '%s'"
389 " got %d bytes, expected %d or %d bytes\n",
390 filename, bytesRead, chunkSize, params()->addrRange.size()-curSize);
391
392 assert(bytesRead % sizeof(long) == 0);
393
394 for (int x = 0; x < bytesRead/sizeof(long); x++)
395 {
396 if (*(tempPage+x) != 0) {
397 pmem_current = (long*)(pmemAddr + curSize + x * sizeof(long));
398 *pmem_current = *(tempPage+x);
399 }
400 }
401 curSize += bytesRead;
402 }
403
404 free(tempPage);
405
406 if (gzclose(compressedMem))
407 fatal("Close failed on physical memory checkpoint file '%s'\n",
408 filename);
409
410}
411
412
413BEGIN_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory)
414
415 Param<string> file;
416 Param<Range<Addr> > range;
417 Param<Tick> latency;
418
419END_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory)
420
421BEGIN_INIT_SIM_OBJECT_PARAMS(PhysicalMemory)
422
423 INIT_PARAM_DFLT(file, "memory mapped file", ""),
424 INIT_PARAM(range, "Device Address Range"),
425 INIT_PARAM(latency, "Memory access latency")
426
427END_INIT_SIM_OBJECT_PARAMS(PhysicalMemory)
428
429CREATE_SIM_OBJECT(PhysicalMemory)
430{
431 PhysicalMemory::Params *p = new PhysicalMemory::Params;
432 p->name = getInstanceName();
433 p->addrRange = range;
434 p->latency = latency;
435 return new PhysicalMemory(p);
436}
437
438REGISTER_SIM_OBJECT("PhysicalMemory", PhysicalMemory)
| 214 memcpy(pmemAddr + pkt->getAddr() - params()->addrRange.start,
215 pkt->getPtr<uint8_t>(), pkt->getSize());
216 }
217 }
218 else if (pkt->isInvalidate()) {
219 //upgrade or invalidate
220 pkt->flags |= SATISFIED;
221 }
222 else {
223 panic("unimplemented");
224 }
225
226 pkt->result = Packet::Success;
227}
228
229Port *
230PhysicalMemory::getPort(const std::string &if_name, int idx)
231{
232 if (if_name == "port" && idx == -1) {
233 if (port != NULL)
234 panic("PhysicalMemory::getPort: additional port requested to memory!");
235 port = new MemoryPort(name() + "-port", this);
236 return port;
237 } else if (if_name == "functional") {
238 /* special port for functional writes at startup. And for memtester */
239 return new MemoryPort(name() + "-funcport", this);
240 } else {
241 panic("PhysicalMemory::getPort: unknown port %s requested", if_name);
242 }
243}
244
245void
246PhysicalMemory::recvStatusChange(Port::Status status)
247{
248}
249
250PhysicalMemory::MemoryPort::MemoryPort(const std::string &_name,
251 PhysicalMemory *_memory)
252 : SimpleTimingPort(_name), memory(_memory)
253{ }
254
255void
256PhysicalMemory::MemoryPort::recvStatusChange(Port::Status status)
257{
258 memory->recvStatusChange(status);
259}
260
261void
262PhysicalMemory::MemoryPort::getDeviceAddressRanges(AddrRangeList &resp,
263 AddrRangeList &snoop)
264{
265 memory->getAddressRanges(resp, snoop);
266}
267
268void
269PhysicalMemory::getAddressRanges(AddrRangeList &resp, AddrRangeList &snoop)
270{
271 snoop.clear();
272 resp.clear();
273 resp.push_back(RangeSize(params()->addrRange.start,
274 params()->addrRange.size()));
275}
276
277int
278PhysicalMemory::MemoryPort::deviceBlockSize()
279{
280 return memory->deviceBlockSize();
281}
282
283Tick
284PhysicalMemory::MemoryPort::recvAtomic(Packet *pkt)
285{
286 memory->doFunctionalAccess(pkt);
287 return memory->calculateLatency(pkt);
288}
289
290void
291PhysicalMemory::MemoryPort::recvFunctional(Packet *pkt)
292{
293 // Default implementation of SimpleTimingPort::recvFunctional()
294 // calls recvAtomic() and throws away the latency; we can save a
295 // little here by just not calculating the latency.
296 memory->doFunctionalAccess(pkt);
297}
298
299unsigned int
300PhysicalMemory::drain(Event *de)
301{
302 int count = port->drain(de);
303 if (count)
304 changeState(Draining);
305 else
306 changeState(Drained);
307 return count;
308}
309
310void
311PhysicalMemory::serialize(ostream &os)
312{
313 gzFile compressedMem;
314 string filename = name() + ".physmem";
315
316 SERIALIZE_SCALAR(filename);
317
318 // write memory file
319 string thefile = Checkpoint::dir() + "/" + filename.c_str();
320 int fd = creat(thefile.c_str(), 0664);
321 if (fd < 0) {
322 perror("creat");
323 fatal("Can't open physical memory checkpoint file '%s'\n", filename);
324 }
325
326 compressedMem = gzdopen(fd, "wb");
327 if (compressedMem == NULL)
328 fatal("Insufficient memory to allocate compression state for %s\n",
329 filename);
330
331 if (gzwrite(compressedMem, pmemAddr, params()->addrRange.size()) != params()->addrRange.size()) {
332 fatal("Write failed on physical memory checkpoint file '%s'\n",
333 filename);
334 }
335
336 if (gzclose(compressedMem))
337 fatal("Close failed on physical memory checkpoint file '%s'\n",
338 filename);
339}
340
341void
342PhysicalMemory::unserialize(Checkpoint *cp, const string §ion)
343{
344 gzFile compressedMem;
345 long *tempPage;
346 long *pmem_current;
347 uint64_t curSize;
348 uint32_t bytesRead;
349 const int chunkSize = 16384;
350
351
352 string filename;
353
354 UNSERIALIZE_SCALAR(filename);
355
356 filename = cp->cptDir + "/" + filename;
357
358 // mmap memoryfile
359 int fd = open(filename.c_str(), O_RDONLY);
360 if (fd < 0) {
361 perror("open");
362 fatal("Can't open physical memory checkpoint file '%s'", filename);
363 }
364
365 compressedMem = gzdopen(fd, "rb");
366 if (compressedMem == NULL)
367 fatal("Insufficient memory to allocate compression state for %s\n",
368 filename);
369
370 // unmap file that was mmaped in the constructor
371 // This is done here to make sure that gzip and open don't muck with our
372 // nice large space of memory before we reallocate it
373 munmap(pmemAddr, params()->addrRange.size());
374
375 pmemAddr = (uint8_t *)mmap(NULL, params()->addrRange.size(), PROT_READ | PROT_WRITE,
376 MAP_ANON | MAP_PRIVATE, -1, 0);
377
378 if (pmemAddr == (void *)MAP_FAILED) {
379 perror("mmap");
380 fatal("Could not mmap physical memory!\n");
381 }
382
383 curSize = 0;
384 tempPage = (long*)malloc(chunkSize);
385 if (tempPage == NULL)
386 fatal("Unable to malloc memory to read file %s\n", filename);
387
388 /* Only copy bytes that are non-zero, so we don't give the VM system hell */
389 while (curSize < params()->addrRange.size()) {
390 bytesRead = gzread(compressedMem, tempPage, chunkSize);
391 if (bytesRead != chunkSize && bytesRead != params()->addrRange.size() - curSize)
392 fatal("Read failed on physical memory checkpoint file '%s'"
393 " got %d bytes, expected %d or %d bytes\n",
394 filename, bytesRead, chunkSize, params()->addrRange.size()-curSize);
395
396 assert(bytesRead % sizeof(long) == 0);
397
398 for (int x = 0; x < bytesRead/sizeof(long); x++)
399 {
400 if (*(tempPage+x) != 0) {
401 pmem_current = (long*)(pmemAddr + curSize + x * sizeof(long));
402 *pmem_current = *(tempPage+x);
403 }
404 }
405 curSize += bytesRead;
406 }
407
408 free(tempPage);
409
410 if (gzclose(compressedMem))
411 fatal("Close failed on physical memory checkpoint file '%s'\n",
412 filename);
413
414}
415
416
417BEGIN_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory)
418
419 Param<string> file;
420 Param<Range<Addr> > range;
421 Param<Tick> latency;
422
423END_DECLARE_SIM_OBJECT_PARAMS(PhysicalMemory)
424
425BEGIN_INIT_SIM_OBJECT_PARAMS(PhysicalMemory)
426
427 INIT_PARAM_DFLT(file, "memory mapped file", ""),
428 INIT_PARAM(range, "Device Address Range"),
429 INIT_PARAM(latency, "Memory access latency")
430
431END_INIT_SIM_OBJECT_PARAMS(PhysicalMemory)
432
433CREATE_SIM_OBJECT(PhysicalMemory)
434{
435 PhysicalMemory::Params *p = new PhysicalMemory::Params;
436 p->name = getInstanceName();
437 p->addrRange = range;
438 p->latency = latency;
439 return new PhysicalMemory(p);
440}
441
442REGISTER_SIM_OBJECT("PhysicalMemory", PhysicalMemory)
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